I have an A90 Supra, and I've gone through 3 pass side axle boots. 3! Is there a company that makes a stronger boot? I've been using replacement boots I've had to make fit due to there being no direct replacement other than buying a whole axle. Anyone???? 
If you go to this link you can find a boot and its part number that is close by size. Then do a Google search on that part number to get the application. Now you can search for a boot for that vehicle. In the off road world you can find high angle CV boots that are a bit more durable, you may want to look at one of those. It may be able to hold up against the heat.
I assume it's residual heat issue w an insulated exhaust pipe being the source? Boot tore outer edge of bellows, not in deep groove.....
Im too looking for more durable boots but for an 80's Honda. I've rebooted the original oem axles 4 times until finally replacing axles around 250k 2 yrs ago. I've been using 80's nos Honda stock boots (I. shy away from Chinese parts) over the years. Have no experience w aftermarket. My issue is wear of outer boot on FWD.
im not familiar w the Supra. But have a couple IS300's. RWD. Ones at 170k w original boots. I recall boots are molded thermoplastic, not rubber. I'd focus on different boot materials as well
I was in injection molding of thermoplastics and compounding/transfer molding of rubber. Lots of variability in rubber compounds even of same compound -- even Mil Spec compounds. Thinking an injection molded boot might give you better heat durability. However, I know from rebuilding my axles, I can't disassemble my outer joint and need to stretch the smaller boot end over the thicker part of the axle to slide it down shaft. So I have to use rubber boots
Im impressed w Japanese oe materials quality. Be nice to find a matching FWD outer boot off a Toyota somewhere
Probably just need a thin heat shield
A90? Its not under warranty?
I see you have what looks like an aftermarket exhaust going quite close. Probably cooking the grease and making things worse. I would try and fab some sort of hd heat shield there besides the wrap.
Quantify how much heat builds up next to the boot. Consider a K-type thermo couple wire attached to ur multimeter. Measure the other joint as a baseline. Find an attachment method to use. I'm sure temps will vary over speed. Then heat build up when stopped, heat soaking at a light. My guess is over 150-180f is not good. The friction of the joint and grease might add 30f to the boot
Consider different brands of insulation/shielding wrap on the pipe. Might need to wrap pipe farther up stream. make thicker. Maybe a couple alternating layers of insulation/shielding in attempts to create air gap layers. Could attach thermocouple to last layer and know the effectiveness instantly
I like the heat shield suggestions. consider baffles/bends to bring in cooler air into the boot area from the side of the car slightly. double-walled shield? Space is tight.
Can the pipe be modified to move it farther away
I did a 5000 mile trip in my car last month. Had several water bottles on the floor next to catalytic converter covered in blankets. Water was warm from the heat soak through the floor.
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